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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ddc8af2008d34a6031d19c1aa084e3d06ffa820255249e6ff0a93ea4d98c9c6' 
  AND token = 'JeXCCkSJfkDRf0x/gW+urGKVaaDLaqYFY8sxiCH668Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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