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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '32e20f84fad86b26ef3d45f82f5a52e0b8764da9a07b19aca53d88ea5060ff96' 
  AND token = 'gEZDzsTpo/C/jzfs9p2ftygU4NPNOgcU4qbJZo4k/u0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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