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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a6a0928b02cad7e02a11512dd8055418267d0bc18eb0449a3d4fc7e6c5669fb' 
  AND token = 'Zx75FtotwwSfh29vV7DCH9s007KvnWc/MAgP+AUVmCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}