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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b110b1ee54728c20631053d3df7d51e8c3c7b1663caa94c3fa2fdfce685612bc' 
  AND token = '/4dEArTIf7c/ZAAgeCP3ZlKnZe5qLU1pX35767V8L8o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00062

JSON explain

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