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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4c2944ed91637f6eecf66c39de4e59d50596c723669926ac8d4d0f0f25e1884b' 
  AND token = 'eh2hyTYDaTjMcCYaKpNN2+2JcZ64q2CaNewSSEDbeTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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