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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a60b8b82bad688b987334446cee1dac3407678df121e29ee59676d3892c2a2bb' 
  AND token = 'FY8XGyfLUStymI2QvuY+8u14I7z6M7+nDLzaMvqwOBc=' 
  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"
    }
  }
}