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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f34daea889ac35e20415fe8300a100c2fb9d89afd8b2d15f887adc41c6cd288e' 
  AND token = 'Im8XX3u5DNvk/g85iP3CHhk2MKrLfenlLeMELi696yI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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