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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '609cf758e11102055f80fb2ad8acd556cb4302b4ccd12a8a979c659c0e19ccfb' 
  AND token = 'o5CWTKiTE4XNyAzT7a2WaFxpuj/L6RD39B0NBS49Rwo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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