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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2c156ae06a03fd60cc6f5c1accbe7fb48c21923beed28e295158f4316fb6b33' 
  AND token = '/gozVV3tp3VdyGYjmKj/5rx9IZgXzbBZnary68cF2QM=' 
  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"
    }
  }
}