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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '48f47c60ad857ef2d46fd92c280c0a1e3a74ed1e50e6f4b7560d32348a07daa3' 
  AND token = 'r1pDshBLXSvGghmHiq4Dx+Vi2a7y6ebQtpaYrQXi3KA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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