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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5b63cfd7144cc15938a62f025d0ba21cde18f70550a7b68b85fe3c628fc5671' 
  AND token = '7/cKjl+xk2QchCtXu9bkosiwU52/hx3ONUiha573spc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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