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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc9a191a247e5c541fb8cf0474acf7f21da9b8b794f7e6b9e4d470562a31aa81' 
  AND token = 'Cz513PJUWxvMKW4dsRqdR+1Qthu1rB7Q/AoQu2bno90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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