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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20e4b94c56c811da1d6573ba4ebf32f9c52a8646cdb6e0e821cfba1d181a2c69' 
  AND token = 'p2bAMiEtt37sFvAlkO3w1fSALo17E6SRSFUOQ56EtYE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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