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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3fd0faeb79ca88ea2d37e9bde0fbcef3d9fd4a28261fb76b19e06386976afe3' 
  AND token = '1Y2/+5mvS9w3RkoKEzpPu6C0IK7qcsDynQ6O1uHRL1U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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