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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60cdfbdd41cefc18e36795f7a6440bfba3fc1a1fb81c9c68713a67dcbca0b2ed' 
  AND token = 'LntWGYpoM/TkAHA4Y0w79BZCPxAoteSAb2o4J0MWfsQ=' 
  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"
    }
  }
}