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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8fa5b8076f6040edc530988e6902fa43101b918f74cd9a7a3a2f77b4b599414a' 
  AND token = 'KE3cHPIdO4ZM0Igi4Lo0/1lJfws14QHEUruAFKKbtAo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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