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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5116299438e99d20c26e5578914646a0e5dabf00a4e5317d42908d878c62f3df' 
  AND token = '9cJltdZ+0q29kvSPzp1961TfKyuD6ZSrpoky81Pf+ys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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