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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '96a58181b8e6761a1d30b145fa93e70be7df02c2dfd350d42c4f4f714c98f3c6' 
  AND token = 'HmvuqChgtQt/34657TSaLM1i3OqVFOs5Nv3BiU9lYu0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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