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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee0dbe7cd4f84ac64a2e8d282dd12a1cb9e0398caed002ccf467a825f3c7e325' 
  AND token = 'bNGgzkUE5Qfs/CfyrgImHh2vj1y6rNH4rZ7aHgRSnz4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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