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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2151d17baa3a1d561c1889b8c34091a27f9fe8d1d0c88982cd63b10f9f5274c0' 
  AND token = 'fj8MXRYJcHixx9uZSb4yl00+mJBGy95NP99BZaYcu8o=' 
  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"
    }
  }
}