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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd36c68fa06078f026006eee3d2718cfe90baf10fb55b957b8553b9b66a38f1a' 
  AND token = 'hmk4Pm960wEIt9NRKEIKZ0qJvBcrWmtXsoWAw90Vm/U=' 
  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"
    }
  }
}