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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '92c4b4f7f6315eca5dd91bbd873eb4366debeeae4a1f0ce75a1a09e7c9cde467' 
  AND token = 'uL8PKl3DmZSvsWLgUau6gYgPGmhOcGSYthQ1ueJQbpM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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