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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a3456edc665a41fb96ec0b035966ed171616235a7f8a74643798e003079e8c0' 
  AND token = 'cRnpta5v/YtYNwc5C4aRoH+royw/dcST0Yn7+I9tLm8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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