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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0781650894a18b8310ea9739601e68c1a8c13b0078a1a5d4094864d8f5772a0b' 
  AND token = 'VMcf+gzUvo0d4FJNpchJwzx2XO7MxsZENrctyMzzB0E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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