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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5a188d564a962a05f32e95d2a566096b7516152a8cbf91b425e3996bb3e009fe' 
  AND token = 'j8tuIPDt+X3NK4CjY7nkeo4dhSQ7bUebfbfY53Qzo2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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