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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '51496742fc3e008e8d9b6621afd1da768d3b5193fded35618ace262bc4f2c373' 
  AND token = 'HWyrTECGC6Dm7m3e6za5SKGxWJl/eYvSoeDsXaear70=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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