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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '08c3082fe8b12e0f19f36aa71a909d580229d21ad6c4b0d190c5aed63b2b7ac6' 
  AND token = 'nnr8I+WGjI5OV3/1DnRrUjBgkoc+cR/H8BFMb/kdFTw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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