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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a544fc425dd78f108180fee3390feb344f5490ac4c227f2dff7a35efab1ff96e' 
  AND token = '+inLRA2WFWuUwX0WAjLYR2USJnFTAkrkmguRJm1m6ZM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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