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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c12088076bd2e4d054616232845910cea68abd8fcf1cd9f69cc6f4d961d93a41' 
  AND token = 'FPJZ1z4lYaD87a82NtqMkFFIyJz2WhgdY9UJcICb/1E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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