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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef02cc6d8f0157733a9e0748aa433442e38b2d08b6ec3608807f9b205f3407c9' 
  AND token = 'l4zOQbAyh0c3vScz693Qq9/ZPwvQ42g10d8kt2cM4VA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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