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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0deb2c9203a9e25d0dd0b466e26c0483c254ede41549f6e37c6cb670d894b799' 
  AND token = '481SqLAaMbeSaDuTgIgl55YMIFw2JVsMVWAMRhUJHBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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