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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4556e7006ac66703f8fd82744688afbd51a240354c5955a4b38223ec8aa5f19' 
  AND token = '4c5DiisjGv3O8Sy7VppD/4xkRzphzrRYiuzlsQBz0Qk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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