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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '63a329ded88bfdeade6624948f0c4f8079a842f1a128867f1a00d5499ce35b67' 
  AND token = 'hEZchQad1LdY5VCr9nDuIc4Gn3O46NQxw/qPy5pegW0=' 
  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"
    }
  }
}