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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f6fa70992318de417a4c98a9b4e04322aedd6c7331c95f8426d7bbbe820d5dd1' 
  AND token = 'rH677YdUxUQYrnl6aVmFV/KN1/OMgNOyroSm2im+VBQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00014

JSON explain

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