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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b6ee500cecedecb0d9c5cc8d7df505446dd8ef8a98ec149dab601ce516ae64e6' 
  AND token = 'WA4ZlLPg+2x2NN3mdmHrBcOC8tImrjoPnXt1VF5XJOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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