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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'efb149b15a497a173e2bff119aeb322c75262ba64fbc107e6360fdec512b682b' 
  AND token = 'g/egHE1z6myGXNuUD2dZdwj4OSmo2W07gtv/CNMrlQE=' 
  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"
    }
  }
}