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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '97cb3e0fe1529cd1a3b4623d0f649d9d39489e9984e4e9dfb16c6c18375eff9a' 
  AND token = 'cFQHAX1UlcnVCuOpEFVB76hRoDxCvjZBzNtEqxbt1Us=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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