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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7614887c2afbc2be2ffd7f8ad55555434aba7a6e83fff46c8bd92227e6fe71a2' 
  AND token = 'Zd90lyKBIbvhq4RLhSDFl12Gg2gGtqLlzFa4ccR0ydY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00046

JSON explain

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