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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '54d51b7a8437130af6725ca907a6c6e72abadd2fd9a1d552ed59a3d5061a49d6' 
  AND token = '+FqSABmUousz6MN8hXToareK72oFrf4QE51cKlfaknA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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