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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7f527b02c8d5dbb8dc5aaf08ab7686af06ca2de31944137c42014fde0a28e39' 
  AND token = 'zorc9DD6jm5mV1G/Fxs0e6t8WH2mbnIVn230ftakzlk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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