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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '919a68ddda51af69bc4dc3e941fac9e6ff46a1d94e0db86326c9ec90b9fc36b4' 
  AND token = '1bGH1RjnGMjkFK4ltleXyMKEzAIO00smCRjPGkPYW6I=' 
  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"
    }
  }
}