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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71b4049069448655c9fde966313c1b4e1c2a1ab9555f3ed56a8ad249945565a8' 
  AND token = 'bJCR3bpEssF7cItZEBTSZZu4XYZQrlTIWDXPntY/YxQ=' 
  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"
    }
  }
}