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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e32c1343a15d3c55cfa1ef20c9989e4f0aa4e3d031812263209ff55c9c6b1d7' 
  AND token = 'ivkfZaBc4MmKR7g1MPu0o4jCzgDGWqNeQBM2i7i8j7g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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