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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f663d5f578092d3e8b363fa4bd8f4ed3b3d9a22dc3f396e52780441554092f82' 
  AND token = 'oRKl4Ww1O9fy7+wtF1pvun8w5EB0uPoapO1D3p6h1q0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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