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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '03e2d0dfb79c911001cd0ec7d8efddd7cd961e07df4b1b2e2044a6075fefa116' 
  AND token = 'lpnjKP4/qcW2fsFxQ70N01ORh7cOy/6PktcPBxZiecY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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