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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4d4023157d479c335db032fa4d38856128b8bb7fffed6af7bb322e312177f7c' 
  AND token = 'INjPF89r1i+EOSI7Vniif1a03FZUDM/YexrhBGSKcu8=' 
  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"
    }
  }
}