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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '20d843fa76f7b32a076657eb2291b9f29749f0cc14aeb97fe8f90430ebaf7f0b' 
  AND token = '6jpZA2p1jjgmC5MUQcTkJWNIK6KUIxdf8QuOmrnp08c=' 
  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"
    }
  }
}