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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '503a5cd806c1a5ce82525b10612e25fe0e9c73f89590085c5106eb5eb75f4a84' 
  AND token = 'SL7DGPylIR8KS59d3t0oa3bdCe3+suPsFYSrJhslcSQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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